Journal
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES
Volume 26, Issue 9, Pages 1217-1240Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10762-005-7600-y
Keywords
Terahertz quasioptical spectroscopy; backward-wave oscillator
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Modern Terahertz-subTerahertz (THz-subTHz) spectrometers, based on continuously frequency-tunable coherent sources of radiation, the backward-wave oscillators (BWOs), are described which cover the frequencies v = 1 cm(-1) - 50 cm(-1) (0.03 - 1.5 THz) and allow for measurements at temperatures 2 - 1000 K, also in magnetic fields. They allow for direct determination of spectra of any optical parameter of a material at millimeter-submillimeter wavelengths, the domain where infrared or microwave spectrometers encounter serious methodological difficulties. We report on new technical abilities of the quasioptical BWO-spectrometers and discuss their main components. We demonstrate abilities of the THz-subTHz BWO-spectroscopy by presenting some latest results on measurements of dielectric, conducting, superconducting and magnetic materials.
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